Heidfeld wants more powerful driver union 9 March, 2011 Mar.9 (GMM) Nick Heidfeld would like F1′s driver trade union to have more power. Until returning to the grid last year, the German veteran was the chairman of the safety-oriented Grand Prix Drivers’ Association (GPDA). But with drivers now concerned about excessive Pirelli tyre wear and too many buttons and distractions in the cockpit, Heidfeld admits they are not always listened to. “Unfortunately we don’t always have the most powerful lobby,” he is quoted by Welt newspaper. “If the FIA and Bernie have some ideas to improve the show, they can usually push them through,” added Heidfeld, 33.